DPST-NO Relays | McMaster-Carr

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	Input Voltage Input Voltage

20-275V AC

110-240V AC

3-24V DC

4-32V DC

5V DC

5-32V DC

12V DC

24V DC

24-190V DC

	Switching Voltage Switching Voltage

	Number of Terminals Number of Terminals

	Industry Designation Industry Designation	Show

DPST-NO

	Industry Designation Industry Designation	Hide

	Switching Current Switching Current

	Number of Circuits Controlled Number of Circuits Controlled

	Power Power

	Switch Starting Position Switch Starting Position

2 Off (Normally Open)

2 Off (Normally Open) or 2
On (Normally Closed)

	Mounting Location Mounting Location

DIN Rail

Surface

	Wire Connection Type Wire Connection Type

	Screw Terminals
	Quick- Disconnect Terminals
	Spring-Clamp Terminals

	Operation Type Operation Type

Mechanical

Solid State

	Relay Type Relay Type

	Standard

	Electrical Phase Electrical Phase

Single

Three

	Application Application

Power

Signal

	Specifications Met Specifications Met

CSA

CE Marked

	Switch Action Switch Action

Springs Back (Momentary)

Stays Switched (Maintained)

	Depth Depth

	Height Height

	Width Width

	Mechanical Life Cycles Mechanical Life Cycles

	Number of Mounting Holes Number of Mounting Holes

	Mounting Hole Diameter Mounting Hole Diameter

	Quick-Disconnect Tab Width Quick-Disconnect Tab Width

0.25"

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67 Products

About Relays

Choosing an Electrical Switch

2 Circuits

The built-in enclosure protects contacts from dust and dirt. These relays accept voltage drops up to 50% of the rated voltage without switching. Use them with industrial automation systems, security and emergency lighting, and small motors. Also known as power relays.

			Switching Current @ Voltage
Number of Terminals	Input Voltage	Control Current, mA	Off (Normally Open) Circuit Position	hp @ Switching Voltage	Ht.	Wd.	Dp.	Quick-Disconnect Tab Wd.	Specifications Met		Each
2 Circuits Controlled with 2 Off (Normally Open)—DPST-NO
With Quick-Disconnect Terminals
6	24V AC	71	25 A @ 220 V AC	1 1/2 hp @ 120 V AC 2 hp @ 240 V AC 2 hp @ 277 V AC	1.3"	2.7"	1.9"	0.25"	UL Recognized CSA Certified CE Marked	0000000	000000
6	120V AC	20	25 A @ 220 V AC	1 1/2 hp @ 120 V AC 2 hp @ 240 V AC 2 hp @ 277 V AC	1.3"	2.7"	1.9"	0.25"	UL Recognized CSA Certified CE Marked	0000000	00000
6	240V AC	10	25 A @ 220 V AC	1 1/2 hp @ 120 V AC 2 hp @ 240 V AC 2 hp @ 277 V AC	1.3"	2.7"	1.9"	0.25"	UL Recognized CSA Certified CE Marked	0000000	00000
6	12V DC	158	25 A @ 220 V AC	1 1/2 hp @ 120 V AC 2 hp @ 240 V AC 2 hp @ 277 V AC	1.3"	2.7"	1.9"	0.25"	UL Recognized CSA Certified CE Marked	0000000	00000
6	24V DC	79	25 A @ 220 V AC	1 1/2 hp @ 120 V AC 2 hp @ 240 V AC 2 hp @ 277 V AC	1.3"	2.7"	1.9"	0.25"	UL Recognized CSA Certified CE Marked	0000000	00000

Medium-Current Relays

2 Circuits

Use these relays with industrial automation systems, security and emergency lighting, and small motors. Also known as power relays.

Optional covers protect contacts from dust and dirt.

Relays
			Switching Current									Optional Covers
Number of Terminals	Input Voltage	Control Current, mA	@ 120V AC	@ 28V DC	hp @ Switching Voltage	Ht.	Wd.	Dp.	Specifications Met		Each		Each
2 Circuits Controlled with 2 Off (Normally Open)—DPST-NO
6	24V AC	396	30A	30A	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	UL Listed C-UL Listed	0000000	000000	0000000	000000
6	120V AC	79	30A	30A	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	UL Listed C-UL Listed	0000000	00000	0000000	00000
6	240V AC	40	30A	30A	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	UL Listed C-UL Listed	0000000	00000	0000000	00000
6	12V DC	167	30A	30A	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	UL Listed C-UL Listed	0000000	00000	0000000	00000
6	24V DC	83	30A	30A	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	UL Listed C-UL Listed	0000000	00000	0000000	00000

Long-Life Medium-Current Relays

2-Circuit Relay

With no moving parts, these solid state relays have an extended service life.

Two-circuit relays are rated IP20 for protection against solid objects greater than 12.5 mm, such as fingers. They’re not water resistant.

Heat sinks can be used to disperse heat to increase the relay’s current rating. Mount to 35 mm DIN rail or flat surfaces. Two-circuit relays don’t require silicone for mounting.

Relays
		Switching Current									Heat Sinks
Number of Terminals	Input Voltage	Without Heat Sink	With Heat Sink	Switching Voltage	Ht.	Wd.	Dp.	Specifications Met		Each		Each
2 Circuit Controlled with 2 Off (Normally Open)—DPST-NO
With High-Starting-Current Protection and Covered Terminals and LED Indicator
6	4-32V DC	5A	50A	660V AC	2.3"	1.8"	1.3"	UL Recognized C-UL Recognized CSA Certified CE Marked IP20	0000000	0000000	0000000	0000000
6	4-32V DC	7.5A	75A	660V AC	2.3"	1.8"	1.3"	UL Recognized C-UL Recognized CSA Certified CE Marked IP20	0000000	000000	0000000	000000

DIN-Rail Mount Long-Life Medium-Current Relays

2 Circuits

Mount these relays directly to 35 mm DIN rail. They are solid state, so they have no moving parts and have an extended service life. Relays have an attached heat sink that disperses heat to provide optimal convection cooling.

2 Circuits Controlled with 2 Off (Normally Open)—DPST-NO
Number of Terminals	Input Voltage	Switching Current @ Voltage	Ht.	Wd.	Dp.	Specifications Met		Each
With High-Starting-Current Protection
6	5-32V DC	25 A @ 220 V AC	4.3"	2.1"	4"	UL Listed C-UL Listed	0000000	0000000
6	5-32V DC	25 A @ 600 V AC	4.3"	2.1"	4"	UL Listed C-UL Listed	0000000	000000
6	20-275V AC/24-190V DC	25 A @ 220 V AC	4.3"	2.1"	4"	UL Listed C-UL Listed	0000000	000000
6	20-275V AC/24-190V DC	25 A @ 600 V AC	4.3"	2.1"	4"	UL Listed C-UL Listed	0000000	000000

Hybrid Long-Life Medium-Current Relays

These relays combine solid state and mechanical operation to provide long service life without the need for a heat sink. Use with resistive heating loads; relays cannot be used with motor loads. An LED indicator tells you if the relay is open or closed.

Note: Relays cannot be used with an RC snubber.

							Wire Connection Type
Number of Terminals	Input Voltage	Control Power, VA	Switching Current @ Voltage	Ht.	Wd.	Dp.	Control Terminal	Load Terminal	Quick-Disconnect Tab Wd.	Specifications Met		Each
2 Circuits Controlled with 2 Off (Normally Open)—DPST-NO
7	24V AC/3-24V DC	7.7	35 A @ 240 V AC	3.8"	5.5"	1.9"	Quick-Disconnect	Screw Terminals	0.25"	UL Recognized C-UL Recognized CE Marked	000000	000000
7	110-240V AC	7.7	35 A @ 240 V AC	3.8"	5.5"	1.9"	Quick-Disconnect	Screw Terminals	0.25"	UL Recognized C-UL Recognized CE Marked	000000	00000

Infrequent-Cycle High-Current Relays

2 Circuits

For use with equipment that cycles on and off, these relays meet UL 508 for air conditioning and heating. Connections are accessible from the front, so you can mount relays side-by-side. Also known as definite-purpose contactors.

Enclosures (sold separately) are NEMA 1 rated to protect contacts from corrosion.

Also Available: Auxiliary contacts for 3.8"-7.2" Ht. relays. They allow you to add a signaling device or control another relay. Please select 6564K99, then select the McMaster-Carr part number of your relay and whether you want to switch one circuit on (1 Normally Open) or off (1 Normally Closed).

			Switching Current @ 600V AC		hp @ Switching Voltage
Number of Terminals	Input Voltage	Control Power	Full Load	Resistive Load	Single Phase	Three Phase	Ht.	Wd.	Dp.	Quick-Disconnect Tab Wd.	Specifications Met		Each
2 Circuits Controlled with 2 Off (Normally Open)—DPST-NO
With Quick-Disconnect and Screw Terminals
4	24V AC	6.5VA	20A	30A	1 1/2 hp @ 115 V AC 3 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	24V AC	6.5VA	25A	35A	2 hp @ 115 V AC 3 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	24V AC	6.5VA	30A	40A	2 hp @ 115 V AC 5 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	24V AC	6.5VA	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	24V AC	7VA	15A	20A	3/4 hp @ 115 V AC 2 hp @ 230 V AC	3 hp @ 230 V AC 5 hp @ 460 V AC 5 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	24V AC	10VA	50A	65A	3 hp @ 115 V AC 10 hp @ 230 V AC	15 hp @ 230 V AC 30 hp @ 460 V AC 30 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	24V AC	19VA	90A	120A	7 1/2 hp @ 115 V AC 20 hp @ 230 V AC	30 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	5.1"	3.4"	4.8"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	24V AC	50.4VA	60A	75A	5 hp @ 115 V AC 10 hp @ 230 V AC	20 hp @ 230 V AC 40 hp @ 460 V AC 40 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	24V AC	50.4VA	75A	90A	5 hp @ 115 V AC 15 hp @ 230 V AC	20 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	120V AC	6.5VA	20A	30A	1 1/2 hp @ 115 V AC 3 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	120V AC	6.5VA	25A	35A	2 hp @ 115 V AC 3 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	120V AC	6.5VA	30A	40A	2 hp @ 115 V AC 5 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	120V AC	6.5VA	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	120V AC	7VA	15A	20A	3/4 hp @ 115 V AC 2 hp @ 230 V AC	3 hp @ 230 V AC 5 hp @ 460 V AC 5 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	120V AC	10VA	50A	65A	3 hp @ 115 V AC 10 hp @ 230 V AC	15 hp @ 230 V AC 30 hp @ 460 V AC 30 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	120V AC	19VA	90A	120A	7 1/2 hp @ 115 V AC 20 hp @ 230 V AC	30 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	5.1"	3.4"	4.8"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	120V AC	50.4VA	60A	75A	5 hp @ 115 V AC 10 hp @ 230 V AC	20 hp @ 230 V AC 40 hp @ 460 V AC 40 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	120V AC	50.4VA	75A	90A	5 hp @ 115 V AC 15 hp @ 230 V AC	20 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	24V DC	3.1W	15A	20A	3/4 hp @ 115 V AC 2 hp @ 230 V AC	3 hp @ 230 V AC 5 hp @ 460 V AC 5 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	24V DC	3.1W	25A	35A	2 hp @ 115 V AC 3 hp @ 230 V AC	__	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	24V DC	3.1W	30A	40A	2 hp @ 115 V AC 5 hp @ 230 V AC	__	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	24V DC	3.1W	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	__	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	24V DC	3.1W	50A	65A	3 hp @ 115 V AC 10 hp @ 230 V AC	15 hp @ 230 V AC 30 hp @ 460 V AC 30 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	24V DC	5.1W	60A	75A	5 hp @ 115 V AC 10 hp @ 230 V AC	20 hp @ 230 V AC 40 hp @ 460 V AC 40 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	24V DC	5.1W	75A	90A	5 hp @ 115 V AC 15 hp @ 230 V AC	20 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	208/240V AC	6.5VA	20A	30A	1 1/2 hp @ 115 V AC 3 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	208/240V AC	6.5VA	25A	35A	2 hp @ 115 V AC 3 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	208/240V AC	6.5VA	30A	40A	2 hp @ 115 V AC 5 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	208/240V AC	6.5VA	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	208/240V AC	7VA	15A	20A	3/4 hp @ 115 V AC 2 hp @ 230 V AC	3 hp @ 230 V AC 5 hp @ 460 V AC 5 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	208/240V AC	10VA	50A	65A	3 hp @ 115 V AC 10 hp @ 230 V AC	15 hp @ 230 V AC 30 hp @ 460 V AC 30 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	208/240V AC	19VA	90A	120A	7 1/2 hp @ 115 V AC 20 hp @ 230 V AC	30 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	5.1"	3.4"	4.8"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	208/240V AC	50.4VA	60A	75A	5 hp @ 115 V AC 10 hp @ 230 V AC	20 hp @ 230 V AC 40 hp @ 460 V AC 40 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	208/240V AC	50.4VA	75A	90A	5 hp @ 115 V AC 15 hp @ 230 V AC	20 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000

Enclosures for 60A 3PST-NO Relays and 4PST-NO Relays

00000000

Each

0000000

Sequenced Latching Relays

These relays switch through a series of different circuit configurations every time they receive an input voltage. The input voltage latches them in position, so they don’t require a constant voltage to stay switched. Use them to control motors, pumps, and lighting. The covered terminals prevent contact with live connections. Mount to 35 mm DIN rail. Also known as step relays.

2 Circuits Controlled—DPST-NO
Switch Starting Position	Input Voltage	Control Power	Switching Current @ 24V AC/120V AC	Max. Switching Voltage	hp @ Switching Voltage	Ht.	Wd.	Dp.	Specifications Met		Each
With 6 Terminals
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	24V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	UL Recognized C-UL Recognized CE Marked	00000000	000000
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	120V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	UL Recognized C-UL Recognized CE Marked	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	240V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	UL Recognized C-UL Recognized CE Marked	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	12V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	UL Recognized C-UL Recognized CE Marked	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	24V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	UL Recognized C-UL Recognized CE Marked	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	24V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	UL Recognized C-UL Recognized CE Marked	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	120V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	UL Recognized C-UL Recognized CE Marked	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	240V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	UL Recognized C-UL Recognized CE Marked	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	12V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	UL Recognized C-UL Recognized CE Marked	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	24V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	UL Recognized C-UL Recognized CE Marked	00000000	00000

Two-Hand Safety Switches

It takes two hands to activate these switches, minimizing the risk of accidental equipment start up. A complete system requires two switches, one safety relay, and two outlet boxes.

Safety relays control the two switches by sending an output signal when both switches are activated within 0.5 seconds of each other. Self-monitoring circuitry offers additional protection—if any part of the system fails, the entire system shuts down until repaired.

For technical drawings and 3-D models, click on a part number.

Safety Relays

Safety Relay

No. of Circuits Controlled	Switch Starting Position	No. of Terminals	Industry Designation	Switching Current @ Voltage	Input Voltage	For DIN Rail Ht., mm	Wire Connection Type		Each
2	2 Off (Normally Open) or 2 On (Normally Closed)	4	DPST-NO	4 A @ 230 V AC, 2 A @ 24 V DC	115V AC	35	Screw Terminals	00000000	0000000

Terms and Conditions and Privacy Policy

About Relays

Choosing an Electrical Switch

Enclosed Medium-Current Relays

Medium-Current Relays

Long-Life Medium-Current Relays

DIN-Rail Mount Long-Life Medium-Current Relays

Hybrid Long-Life Medium-Current Relays

Infrequent-Cycle High-Current Relays

Sequenced Latching Relays

Two-Hand Safety Switches